diff --git a/tests/dnn/dnn-layer-mathunary-test.c b/tests/dnn/dnn-layer-mathunary-test.c
index f032ca0684..ed42198195 100644
--- a/tests/dnn/dnn-layer-mathunary-test.c
+++ b/tests/dnn/dnn-layer-mathunary-test.c
@@ -32,6 +32,8 @@ static float get_expected(float f, DNNMathUnaryOperation op)
     {
     case DMUO_ABS:
         return (f >= 0) ? f : -f;
+    case DMUO_SIN:
+        return sin(f);
     default:
         av_assert0(!"not supported yet");
         return 0.f;
@@ -77,5 +79,7 @@ int main(int agrc, char **argv)
 {
     if (test(DMUO_ABS))
         return 1;
+    if (test(DMUO_SIN))
+        return 1;
     return 0;
 }